Update 3.x.md

Author: andrey-helldar

docs/prologue/changelog/3.x.md

@@ -28,7 +28,7 @@
 
 - Removed support for PHP 7.3 and 7.4
 - Removed support for Laravel 6.x
-- Removed use of interface Contracts
+- Removed use of [`Actionable`](https://github.com/TheDragonCode/contracts/blob/main/src/LaravelActions/Actionable.php) interface
 
 See the [`upgrade manual`](https://actions.dragon-code.pro/prologue/upgrade.html) for more information.